Dagon (transformation)

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description
The dagon transformation is a transformation once you get 3 items on the list below, the transformation causes isaac to resemble a fish humanoid, similar to abyssal gapers. The transformation causes isaac to leave behind slowing and glowing cyan creep. And entering a room after every 3 rooms causes isaac to spawn 1-2 blue flies.

items that lead to it
Rainy day

Fish eye

Fishing net